LCD Common Signal Bus Line Resistance Reduction
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Solution Overview
Problem
As liquid crystal display devices increase in screen size and image resolution, the resistance of common signal lines becomes a significant issue, affecting the efficiency of common potential supply and impacting the display performance.
Innovation Solution
The liquid crystal display device incorporates a TFT substrate with multiple wiring layers and interlayer connecting portions to reduce resistance, including a common signal bus line and common potential bus line that connect and overlap to distribute the common potential effectively across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the screen size and resolution are increased, then the display quality is improved, but the resistance of common signal lines increases
Solution Approach 1:
The common signal lines are divided into multiple segments arranged in a matrix pattern, with each segment serving a specific region of the display. This segmentation reduces the length of each individual signal line, thereby reducing resistance while maintaining coverage of the entire high-resolution display area
Solution Approach 2:
The patent transitions from traditional planar signal line routing to a three-dimensional multi-layer wiring structure. Common signal lines are distributed across multiple layers (first, second, and third wiring layers) with interlayer connecting portions, creating a spatial network that reduces resistance by providing multiple transmission paths and shorter effective lengths
2Productivity
If the common potential supply efficiency is improved, then the display performance is enhanced, but the wiring structure becomes more complex
Solution Approach 1:
Multiple common signal lines from different wiring layers are merged at interlayer connecting portions to form a unified common potential supply network. This merging creates redundant transmission paths that improve supply efficiency while the modular matrix arrangement keeps the overall structure organized and manageable
Solution Approach 2:
The multi-layer wiring structure serves multiple functions simultaneously: it provides common potential supply, creates redundant transmission paths for reliability, enables regional segmentation for high resolution, and maintains a systematic layout through the matrix arrangement. This multi-functionality justifies the increased structural complexity
Data Source
AI summary
Provided is a liquid crystal display device including a TFT substrate including a pixel electrode and a common electrode. A GAL layer includes gate signal lines, a CMT layer includes common signal lines and a common signal bus line, and an SDL layer includes data signal lines. At least one of the GAL layer and the SDL layer includes a common potential bus line. Further, the TFT substrate includes an interlayer connecting portion for connecting the common signal bus line and the common potential bus line to each other.